HOME >> BIOLOGY >> NEWS
Size matters if you're a rodent

Promiscuity is common among female rodents, leading to competition between the sperm of rival males over who fertilizes the eggs. It now seems that possessing a longer penis may give males an advantage in this competition, according to new research to be published in the March issue of The American Naturalist. Dr. Steve Ramm, an evolutionary biologist at the University of Liverpool, UK, compared the relative size of the penis bone in several mammal groups: "The data for rodents seem pretty clear cut. Species where sexual competition between males is most intense also tend to have the longest penises. But, interestingly, a similar pattern was not detected in either primates or bats." Understanding the reasons for these differences will require a better understanding of the precise mechanisms through which male rodents benefit from longer penises, something which comparative data alone cannot address.

Overall, the rodent with the longest penis bone relative to its body size in the study was the Western harvest mouse, Reithrodontomys megalotis. "Everything's relative of course," explains Dr. Ramm, "so although big for its body size the penis bone in R. megalotis is still only 7 to 8 mm long. I dont think the phrase 'hung like a harvest mouse' will be catching on any time soon."

The study of genitalia has a long history in evolutionary biology. Because genitalia evolve very rapidly compared to other body structures, they are often the only means through which scientists can tell two closely related species apart. Since their primary function is essentially the same in all animals, this great diversity in genital structure has been something of a puzzle. The new research in mammals adds to a growing body of evidence that sexual selection competition between males and potentially also choice by females is the driving force responsible.


'"/>

Contact: Patricia Morse
pmorse@press.uchicago.edu
773-702-0446
University of Chicago Press Journals
27-Feb-2007


Page: 1

Related biology news :

1. Researchers find that bumblebees flower choice matters
2. Particle size matters to bacteria ability to immobilize heavy metals
3. UCSB researchers discover shape matters to macrophages
4. Size matters: Preventing large mammal extinction
5. Space matters: Estimating species diversity in the fossil record
6. Size matters: fish genitalia attractiveness vs. predatory escape value
7. Field-cricket study shows that when it comes to competition, sperm quality matters
8. See what youre spewing as you speed along
9. 150K to find out why youre a slime ball
10. Pay up, youre being watched
11. Scientists discover new species of distinctive cloud-forest rodent

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Size matters you rodent

(Date:3/20/2015)... and Markets ( http://www.researchandmarkets.com/research/vkzvcs/iris_biometrics ) has announced the ... Report" report to their offering. This report ... The report provides separate comprehensive analytics for the US, ... Europe , Asia-Pacific , ... . Annual estimates and forecasts are provided ...
(Date:3/17/2015)... , March 17, 2015 ... company specializing in clinical study management systems, is ... in attendance at ARENA,s Outsourcing in Clinical Trials ... This event provides an excellent forum for MedNet ... flexible and affordable software-as-a-service (SaaS) eClinical technology platform. ...
(Date:3/16/2015)... HANOVER, Germany , March 16, 2015 /PRNewswire/ ... DERMALOG Identification Systems GmbH will present groundbreaking innovations ... Hanover, Germany . ... DERMALOG,s latest biometric innovation is well at ... the next generation e-gate made in ...
Breaking Biology News(10 mins):Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 2Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 3Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 4Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 5Connect With MedNet Solutions At Outsourcing In Clinical Trials Southeast 2DERMALOG Presents its Latest Biometric Innovations at the Hannover CeBIT Exhibition, 16 - 20 March 2015 2DERMALOG Presents its Latest Biometric Innovations at the Hannover CeBIT Exhibition, 16 - 20 March 2015 3
(Date:3/26/2015)... 26, 2015 ReliantHeart, Inc., an innovative ... a supplier of precision transit-time flow measurement solutions, are ... improve the efficiency of the HeartAssist5® Left ... to experience greater mobility and peace of mind. ... flow board, will draw 1/6th of the power required ...
(Date:3/26/2015)... Ale Gicqueau, Founder and President of Clinovo, will co-present ... Technology, on “ Conducting Postmarket Registries - Rationale and ... and Exhibition on April 25th through April 28th in ... presentation, Ale Gicqueau and Victor Chen will discuss the ... requirements and resources to conduct the registry, as well ...
(Date:3/25/2015)... the most attractive in the emerging European region, mainly ... and increasing government investment in healthcare, according to a ... set to grow at twice the pace of the ... reaching an approximate market value of $43-60 billion by ... Cross provides total healthcare solutions that address the evolving ...
(Date:3/25/2015)... , March 25, 2015 /PRNewswire/ - SQI Diagnostics Inc. ("SQI" ... as a result of recent discussions with certain shareholders ... of the Company, after dealing with certain matters including ... meeting of shareholders on March 26, 2015 (the "Meeting") ... election of directors will take place when the Meeting ...
Breaking Biology Technology:LVAD patients to have greater mobility and peace of mind through Transonic and ReliantHeart’s True Flow collaboration for the HeartAssist5® 2LVAD patients to have greater mobility and peace of mind through Transonic and ReliantHeart’s True Flow collaboration for the HeartAssist5® 3Clinovo Presents at ACRP 2015 in Salt Lake City, Utah on April 25th-28th 2Clinovo Presents at ACRP 2015 in Salt Lake City, Utah on April 25th-28th 3SQI Diagnostics Inc. Announces New Nominees to SQI Diagnostics Board and Adjournment of Meeting 2SQI Diagnostics Inc. Announces New Nominees to SQI Diagnostics Board and Adjournment of Meeting 3SQI Diagnostics Inc. Announces New Nominees to SQI Diagnostics Board and Adjournment of Meeting 4SQI Diagnostics Inc. Announces New Nominees to SQI Diagnostics Board and Adjournment of Meeting 5
Cached News: